太陽熱 發電에 關한 硏究 : 選擇吸收器의 效率改善方案을 中心으로 = A Study on the Solar Thermal Power Generation : Especialiy on the improvement method of efficiency for the Selective absorber

다국어 초록 (Multilingual Abstract)

The most important component in achieving high efficiency of a fixed, evacuated solar collector is the selective absorber.
High quality optical properties (high absorptance and low emittance) and high temperature duability of the selective absorber are more important for the efficient and lasting operation of a fixed, evacuated, concentrating collector designed for operation at higher temperatures than for any other type of collector.
In this paper, the improvement method of formation of the selective absorbers has been described. In order to obtain a low cost selective absorber for collector, silvering a number of glass samples by the Brashear process, subsequently electroplating and baking them in different conditions.
This selective surface of the samples consists of a number of thin layers on a supporting substrates, including a carbonaceous absorbing layer, a catalyst layer, and a metallic infrared reflecting layer. The catalyst layer serves to catalyze the pyrolysis of a carbon containing gaseous compound to form the carbonaceous layer.
The solar absorptance at AM2 and thermal emittance at 100℃ of the ideal selective absorber are known as 0.94 and 0.05 respectively.
The best qualified samples in the experiments are 109B, 142L and 135L. The solar absorptance at AM2 and thermal emittance at 100℃ of these samples are calculated as follows: 109B : 0.94, 0.067, 142L : 0.94, 0.0683, 15L : 0.94, 0.070